The charters containing anthroponyms and toponyms in Hungarian are the most important sources of the early history of the Hungarian language. So far, special attention has been paid to genuine charters only. Considering, however, the availability of sources from the early period of Hungarian literacy, other source types (copies or even fakes) should also be involved in linguistic research. That is the main reason why the author chose a document for her work which has not survived in its original and authentic form of 1075, i.e. from the 11^th century. What is known to us is an interpolated version of the founding charter of Garamszentbenedek Abbey, furnished with complements in the second half of the 13^th century. The author carried out a monographic description of the charter and the nearly 280 toponyms contained in it. Apart from the linguistic analysis, she also set the aim to lay the methodological foundations of the ways that can be used for the processing of new documents, especially those which have a philological interes bur are of uncertain origin.

The text of the founding charter is discussed in five parts. The first part demonstrates the most important features of the Hungarian scribal practice in writing charters. It also touches upon the question of how and to what extent the surviving charters have been studied and mention is made of a few specific features of interpolated charters. In the second chapter the author discusses the origins of the abbey and its founding charter, describing some of the changes in the evaluation of the charter concerning its philological usefulness. The third large section raises issues concerning the philological source value of the charter. The analysis of two descriptions of nearby fields, which is of paramount importance, can be found in the fourth chapter. One of them describes the immediate vicinity of the abbey. The other (Sági estate) deserves attention because its text, besides of the founding charter, has survived in another document as well. These circumstances have created a good opportunity for comparative tests as well as ascertaining the circumstances of interpolation. In this chapter, besides the analysis of field descriptions, the author subjected to historical-linguistic examination Huger and Susolgi, two toponyms of uncertain origin. The relation between Hungarian toponyms and the Latin text of the charter is also discussed here. Finally, in the fifth chapter, the author lists every Hungarian element of the founding charter using a dictionary entry format.